An enormous amorphous silica stock in boreal wetlands

An enormous amorphous silica stock in boreal wetlands
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北方湿地中存在巨大的无定形二氧化硅库存

DOI:
10.1029/2010jg001324
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发表时间:
2010
影响因子:
--
通讯作者:
D. Conley
D. Conley
中科院分区:
--
文献类型:
--
作者:
E. Struyf;C. Mörth;C. Humborg;D. Conley

文献摘要

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我们研究了瑞典北部北方湿地的非晶硅 (ASi)。我们在上层土壤中发现了大量的 ASi(高达干重的 11%),以硅藻壳和植物 ASi 的形式存在。随着土壤剖面深度的增加,观察到 ASi 浓度呈指数下降。逆向建模方法表明,植被占据了风化溶解硅 (DSi) 的很大一部分。 N 和 C 的同时分析表明 ASi 池的周转速度更快,泄漏量更高。我们观察到的生物缓冲的规模是前所未有的,并且支持了 DSi 的生物吸收对于控制 DSi 从陆地生态系统的输出的重要性的新兴范式。我们的结果使当前的硅酸盐传输模型变得复杂,强调了将生态系统生物缓冲纳入我们的硅生物地球化学概念的必要性。
We investigated amorphous Si (ASi) in a boreal wetland in northern Sweden. We found enormous stocks of ASi in the upper soil layers (up to 11% of dry weight), in the form of diatom frustules and plant ASi. A consistent exponential decrease in ASi concentrations was observed with increasing depth in the soil profile. An inverse modeling approach shows that vegetation takes up a substantial part of weathered dissolved Si (DSi). Concurrent analysis of N and C indicates a faster turnover in and a higher leakage from the ASi pool. The magnitude of the biological buffering we observed is unprecedented and supports the emerging paradigm of the importance of biological uptake of DSi governing the export of DSi from terrestrial ecosystems. Our results complicate current models of silicate transport, highlighting the necessity to incorporate ecosystem biological buffering in our concept of Si biogeochemistry.